A study is done to see if the average age a "child" moves permanently out of his parents'

home in the United States is at most 23. Forty-three U.S. adults, all age 40, were surveyed. The

sample average age was 24.2 with a standard deviation of 3.7. Is there evidence to suggest that the

average age a "child" moves permanently out of his parents' home has increased?

(ii) what is the test value (test statistics)?

(a) - 2.13

(b) 2.13

(c) 0.32

(d) - 0.32

(e) 1.96